[Regional histology of the epididymis in the South American opossum. Light microscope study].

The opossum epididymis was subdivided into 7 histologically distinct zones. 2 zones are localized into the head (initial segment or zone I and zone II); 3 zones into the body (zones III, IV and V), and 2 zones into the tail (zones VI and VII). It was found that each zone could be readily distinguished on the basis of its histological and cytological features at optical microscopic level and primarily on the basis of the morphological appearance of the principle cells.